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Debt - Additional Information (Detail) - USD ($) $ in Thousands, shares in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Mar. 31, 2015 | Sep. 30, 2015
Debt Instrument [Line Items] |  |
Total consideration for repurchase of warrants |  | $ 154,681
3.75% Convertible Senior Notes [Member] |  |
Debt Instrument [Line Items] |  |
Warrants repurchased | 4.7 |
Total consideration for repurchase of warrants | $ 154,700 |
Gain (loss) on change in the fair value of the derivative liability |  | $ 20,200

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5618551-113959 + Details
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- Definition The aggregate amount paid by the entity to reacquire the right to purchase equity shares at a predetermined price, usually issued together with corporate debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3291-108585 + Details
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